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Memo-ize some computed stuff to control CPU utilization.

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This commit is contained in:
Adam Ierymenko 2016-11-09 12:34:20 -08:00
parent 3d948a930e
commit 1ebfca666d
2 changed files with 52 additions and 29 deletions
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20
controller/EmbeddedNetworkController.cpp
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@ -1535,6 +1535,9 @@ unsigned int EmbeddedNetworkController::handleControlPlaneHttpDELETE(
return false; // delete
});
Mutex::Lock _l2(_nmiCache_m);
_nmiCache.erase(nwid);
responseBody = network.dump(2);
responseContentType = "application/json";
return 200;
@ -1614,6 +1617,16 @@ void EmbeddedNetworkController::_getNetworkMemberInfo(uint64_t now,uint64_t nwid
char pfx[256];
Utils::snprintf(pfx,sizeof(pfx),"network/%.16llx/member",nwid);
{
Mutex::Lock _l(_nmiCache_m);
std::map<uint64_t,_NetworkMemberInfo>::iterator c(_nmiCache.find(nwid));
if ((c != _nmiCache.end())&&((now - c->second.nmiTimestamp) < 1000)) { // a short duration cache but limits CPU use on big networks
nmi = c->second;
return;
}
}
{
Mutex::Lock _l(_db_m);
_db.filter(pfx,120000,[&nmi,&now](const std::string &n,const json &member) {
try {
@ -1651,6 +1664,13 @@ void EmbeddedNetworkController::_getNetworkMemberInfo(uint64_t now,uint64_t nwid
} catch ( ... ) {}
return true;
});
}
nmi.nmiTimestamp = now;
{
Mutex::Lock _l(_nmiCache_m);
_nmiCache[nwid] = nmi;
}
}
} // namespace ZeroTier

3
controller/EmbeddedNetworkController.hpp
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@ -96,7 +96,10 @@ private:
unsigned long activeMemberCount;
unsigned long totalMemberCount;
uint64_t mostRecentDeauthTime;
uint64_t nmiTimestamp; // time this NMI structure was computed
};
std::map<uint64_t,_NetworkMemberInfo> _nmiCache;
Mutex _nmiCache_m;
void _getNetworkMemberInfo(uint64_t now,uint64_t nwid,_NetworkMemberInfo &nmi);
// These init objects with default and static/informational fields